Internal coaster-brake lock.



W. C. CHAPMAN.

INTERNAL COASTER BRAKE LOCK.

APPLICATION FILED MAY 20, 1914.

Patented June 1, 1915.

2 SHEETS-SHEET I.

THE NORRIS PETERS C0,, PHOTCLITHO.. WASHINGTON, D. c

W. C. CHAPMAN.

INTERNAL COASTER BRAKE LOCK.

APPLICATION FILED MAY 20, 1914.

1 1 4; 1 J74. Patented June 1, 1915.

2 SHEETS-SHEET 2- M W/ML IE NORRIS PETERS 60., PHDTO LITHQ. WASHINGTON 04 C.

WILLIAM C. CHAPMAN, OF GBOVETOWN, GEORGIA, ASSIGNOR OF ONE-HALF T0 JOHN F.

. BRIGKLE, OF AUGUSTA, GEORGIA.

INTERNAL GOASTER-BRAKE LOCK.

To all whom it may concern:

Be it known that 1, WILLIAM G. CHAP- MAN, a citizen of the United States, residing at Grovetown, in the county of Columb1a and State of Georgia, have invented new and useful Improvements in Internal Coaster- Brake Locks, of which the following is a specification.

The invention provides novel means for preventing the unauthorized use or pilfering of bicycles and analogous machines provided with a coaster brake.

The invention consists of a lock mechanism associated with the coaster brake and located internally thereof so as to be out of the way and hidden from view and thereby not to detract from the appearance of the machine or be so noticeable.

The invention consists of a lock mechanism embodying a lock bolt which is arranged within the hub or a portion thereof and is adapted to engage the hub or part inclosing the lock mechanism thereby preventing unauthorized use of the machine or the misappropriation thereof.

The invention further consists of novel means for holding the lock bolt retracted when withdrawn by means of the key and means for tripping such lock bolt whereby the same is released when required so as to come into play and lock the wheel.

The invention consists of the novel features, details of construction and combination of parts, which hereinafter will be more particularly set forth, illustrated and claimed.

In the drawings hereto attached :Figure l is a central longitudinal section of a coaster brake and adjunctive parts provided with a lock mechanism embodying the invention. Fig. 2 is an end-view showing a locking arm for holding the brake band frame against rotary movement. Fig. 3 is a sectional view on the line mm of Fig. 1 showing the lock mechanism and its relation to the hub of the wheel. Fig. 4 is a detail view of the lock mechanism with the cap plate removed and showing the lock bolt held in retracted position. Fig. 5 is a detail view of the cap plate as seen from the inner side. Fig. 6 is a detail View of the arm for holding the brake band frame in fixed position. Fig. 7 is a detail section taken on line g y of Fig. 5.

Corresponding and like parts are referred Specification of Letters Patent.

Patented June 1, 1915.

Application filed May 20, 1914. Serial No. 839,845.

to in the following description, and indicated in all the views of the drawings, by the same reference characters.

The axle 1, fork members 2 supporting the axle 1 and hub 3 are well known parts of a bicycle or analogous machine adapted to receive the elements comprising a coaster brake.

The numeral 4 designates a sprocket wheel which .is loose upon the axle 1 and has a screw 5 formed with or connected thereto in any manner.

A sleeve 6 is mounted upon the screw 5 and cooperates therewith in the well known manner, such sleeve being provided at one end with inner and outer clutch members and such screw receiving the usual drag spring 7 A friction cone 8 is mounted upon the axle and cooperates with the inner clutch member ofthe sleeve 6.

Lugs 9 project outwardly from the friction cone 8 and are adapted to engage dogs 10 mounted upon a frame 11 which is held stationary and receives the brake bands 12 which are expanded by means of the lugs 9 upon back pedalling. These several parts are of well'known coaster brake construction and are illustrated to demonstrate the application of the present invention.

The brake drum 18 at one end of the hub 3 is extended and is formed upon its inner side with a plurality of openings 14 any one of which is adapted to receive the projecting part of the lock bolt. The pins 15 upon which the dogs 10 are pivotally mounted project outwardly from the frame 11 and enter openings 16 formed in the cap 17 p which incloses the lock mechanism and is fitted to the frame 11 and secured upon the axle 1 by being threaded thereon.

A plate 18 is fitted against the outer side of the frame 11 and is provided with openings to receive the pins 15 which serve to hold such plate in position. The lock mechanism is fitted to the plate 18 and embodies a lock bolt 19 which is mounted to receive a rectilinear movement, said lock bolt being retained in place and directed in its movements by the pins 15.

A spring 20 of the helical contractile type normally exerts a force tending to hold the lock bolt projected.

An arm 21 forming a part of the lock bolt is adapted to engage a detent 22 to hold the stated; I

look bolt in retracted position when thrown inward by means of the key 23. The detent 22 is" acted upon by means of a spring 24 so that when the lock bolt is withdrawn by the action-of the key the stopat the end of the detent engages with a stop of the arm 21 and holds the lock bolt in the withdrawn 110- I sition A finger piece 25 is connected with the detent 22 and when pressed upon disengages the detent from the arm 21 thereby releasing the lock bolt 19 which is shot forward by the action of the spring 20 so as to engageany one of the openings 14 of the brake drum 13 thereby locking the wheel against rotation. The finger iece 25 is located exso as to be conventeriorly of the cap 1 iently tripped when it is required to release the lock bolt. The cap 17 is formed with a keyhole which registers with a key hole 2G formed in the arm '27 by means of which the cap 17 and frame 11 are held from turning.

A guard 28 closes the key hole 26.

Interlocking teeth 29 are formed upon the adjacent sides of the arm 27 and cap. 17

thereby holding such cap from turning, the

7 frame 11 being held from turning by means the manner hereinbefore of the pins 15 in It will be understood from the foregoing taken in connection with the accompanying drawings that the invention provides an essentially internal locking mechanism for coaster brakes which is simple, effective and susceptible of being readily applied to any type of coaster brake, the construction being such as not to detract from the appearance of the hub or brake and which at'the same time is hidden from view and protected, the brake drum receiving and forming a housing for the lock mechanism. The lock bolt is normally held withdrawn or in retracted position by means of the detent 22 andwhen' the machine is left unattendedthe lock mechanism may be thrown into action by pressing lightly upon the finger piece 25 which. disengages the detent 22 from the lock bolt, the "latter being projected by means of the spring 20 so as to enter any one of the openings 14 of the brake drum and thereby prevent rotation of the wheel in either direction.'

From the foregoing description, taken in connection with the accompanying draw-i ings, the advantages of the construction and of the method of operation will be readily 1 Copies ot this patent may be obtained for apparent to those skilled in the art to which the invention appertains, and while I have Having thus described the invention, what' brake member, a supporting frame for such brake member anda lock mechanism for holding the wheel against rotation mounted upon the supporting frame and adapted to be inclosed by means of thebrake drum so as to be concealed therebyj,

2. In a coaster brake embodying a. brake drum connected with the'hub, a cooperating brake member, asupportingframe for such brakemember, means for holding, such drum in fixed position, and a lock mechanism mounted upon the brake member supporting frame and adapted to engage the brake drum 7 to hold the wheel againstrotationl -3.- Ina. coaster brake embodying a brake drum'carried by the hub of the wheel, a co= a supporting operating brake member, frame for the brake member, a lock bolt mounted upon the brake member supporting frame and adapted to engage theibrake drum, a spring normally tending to project the lock bolt and'a detent mounted upon the V brake member supporting frame to engage i the lock bolt and hold the same in retracted coaster brake, the combinationof j position.

4. In a a brake drum connected with awheel hub, a V

cooperating brake member, a supporting frame for; thebrake membenalock mecha- 7 V n ism mounted upon the brake member supporting frame and adapted to cooperate with the brake drum, a cap for :incl'osing the lock mechanismand heldto thezbrake member supporting frame and meansfori s securing the said cap to the frame M I of the machine to prevent turning.

In testimonylwhereof I my signature in presence of'two witnesses.-

-Vl 7itnesses: 11.03am,

V-JR ssELLL five cents eael ebx addressiing the llom nissioner o1 IBatents,

w i s min-fw" WILLIAM QLCH'APMAN; 

